In 1996, the U.S. Department of Defense awarded Boeing a contract for the concept demonstration phase of the Joint Strike Fighter, or JSF, program competition. Boeing assembled two concept demonstration aircraft, X-32A and X-32B, at its plant in Palmdale, CA. Although not selected for full-scale development of the JSF, the program yielded many advances in stealth technology and design and manufacturing methods. These achievements have been applied to other Boeing programs including the F/A-18E/F Super Hornet and the X-45A Unmanned Combat Air Vehicle, or UCAV.